ip_divert.c revision 139823
1/*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/netinet/ip_divert.c 139823 2005-01-07 01:45:51Z imp $ 30 */ 31 32#if !defined(KLD_MODULE) 33#include "opt_inet.h" 34#include "opt_ipfw.h" 35#include "opt_mac.h" 36#ifndef INET 37#error "IPDIVERT requires INET." 38#endif 39#ifndef IPFIREWALL 40#error "IPDIVERT requires IPFIREWALL" 41#endif 42#endif 43 44#include <sys/param.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/malloc.h> 48#include <sys/mac.h> 49#include <sys/mbuf.h> 50#include <sys/module.h> 51#include <sys/kernel.h> 52#include <sys/proc.h> 53#include <sys/protosw.h> 54#include <sys/signalvar.h> 55#include <sys/socket.h> 56#include <sys/socketvar.h> 57#include <sys/sx.h> 58#include <sys/sysctl.h> 59#include <sys/systm.h> 60 61#include <vm/uma.h> 62 63#include <net/if.h> 64#include <net/route.h> 65 66#include <netinet/in.h> 67#include <netinet/in_pcb.h> 68#include <netinet/in_systm.h> 69#include <netinet/in_var.h> 70#include <netinet/ip.h> 71#include <netinet/ip_divert.h> 72#include <netinet/ip_var.h> 73#include <netinet/ip_fw.h> 74 75/* 76 * Divert sockets 77 */ 78 79/* 80 * Allocate enough space to hold a full IP packet 81 */ 82#define DIVSNDQ (65536 + 100) 83#define DIVRCVQ (65536 + 100) 84 85/* 86 * Divert sockets work in conjunction with ipfw, see the divert(4) 87 * manpage for features. 88 * Internally, packets selected by ipfw in ip_input() or ip_output(), 89 * and never diverted before, are passed to the input queue of the 90 * divert socket with a given 'divert_port' number (as specified in 91 * the matching ipfw rule), and they are tagged with a 16 bit cookie 92 * (representing the rule number of the matching ipfw rule), which 93 * is passed to process reading from the socket. 94 * 95 * Packets written to the divert socket are again tagged with a cookie 96 * (usually the same as above) and a destination address. 97 * If the destination address is INADDR_ANY then the packet is 98 * treated as outgoing and sent to ip_output(), otherwise it is 99 * treated as incoming and sent to ip_input(). 100 * In both cases, the packet is tagged with the cookie. 101 * 102 * On reinjection, processing in ip_input() and ip_output() 103 * will be exactly the same as for the original packet, except that 104 * ipfw processing will start at the rule number after the one 105 * written in the cookie (so, tagging a packet with a cookie of 0 106 * will cause it to be effectively considered as a standard packet). 107 */ 108 109/* Internal variables. */ 110static struct inpcbhead divcb; 111static struct inpcbinfo divcbinfo; 112 113static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */ 114static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */ 115 116/* 117 * Initialize divert connection block queue. 118 */ 119void 120div_init(void) 121{ 122 INP_INFO_LOCK_INIT(&divcbinfo, "div"); 123 LIST_INIT(&divcb); 124 divcbinfo.listhead = &divcb; 125 /* 126 * XXX We don't use the hash list for divert IP, but it's easier 127 * to allocate a one entry hash list than it is to check all 128 * over the place for hashbase == NULL. 129 */ 130 divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask); 131 divcbinfo.porthashbase = hashinit(1, M_PCB, &divcbinfo.porthashmask); 132 divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb), 133 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 134 uma_zone_set_max(divcbinfo.ipi_zone, maxsockets); 135} 136 137/* 138 * IPPROTO_DIVERT is not in the real IP protocol number space; this 139 * function should never be called. Just in case, drop any packets. 140 */ 141void 142div_input(struct mbuf *m, int off) 143{ 144 ipstat.ips_noproto++; 145 m_freem(m); 146} 147 148/* 149 * Divert a packet by passing it up to the divert socket at port 'port'. 150 * 151 * Setup generic address and protocol structures for div_input routine, 152 * then pass them along with mbuf chain. 153 */ 154static void 155divert_packet(struct mbuf *m, int incoming) 156{ 157 struct ip *ip; 158 struct inpcb *inp; 159 struct socket *sa; 160 u_int16_t nport; 161 struct sockaddr_in divsrc; 162 struct m_tag *mtag; 163 164 mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL); 165 if (mtag == NULL) { 166 printf("%s: no divert tag\n", __func__); 167 m_freem(m); 168 return; 169 } 170 /* Assure header */ 171 if (m->m_len < sizeof(struct ip) && 172 (m = m_pullup(m, sizeof(struct ip))) == 0) 173 return; 174 ip = mtod(m, struct ip *); 175 176 /* Delayed checksums are currently not compatible with divert. */ 177 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 178 ip->ip_len = ntohs(ip->ip_len); 179 in_delayed_cksum(m); 180 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 181 ip->ip_len = htons(ip->ip_len); 182 } 183 184 /* 185 * Record receive interface address, if any. 186 * But only for incoming packets. 187 */ 188 bzero(&divsrc, sizeof(divsrc)); 189 divsrc.sin_len = sizeof(divsrc); 190 divsrc.sin_family = AF_INET; 191 divsrc.sin_port = divert_cookie(mtag); /* record matching rule */ 192 if (incoming) { 193 struct ifaddr *ifa; 194 195 /* Sanity check */ 196 M_ASSERTPKTHDR(m); 197 198 /* Find IP address for receive interface */ 199 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) { 200 if (ifa->ifa_addr == NULL) 201 continue; 202 if (ifa->ifa_addr->sa_family != AF_INET) 203 continue; 204 divsrc.sin_addr = 205 ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; 206 break; 207 } 208 } 209 /* 210 * Record the incoming interface name whenever we have one. 211 */ 212 if (m->m_pkthdr.rcvif) { 213 /* 214 * Hide the actual interface name in there in the 215 * sin_zero array. XXX This needs to be moved to a 216 * different sockaddr type for divert, e.g. 217 * sockaddr_div with multiple fields like 218 * sockaddr_dl. Presently we have only 7 bytes 219 * but that will do for now as most interfaces 220 * are 4 or less + 2 or less bytes for unit. 221 * There is probably a faster way of doing this, 222 * possibly taking it from the sockaddr_dl on the iface. 223 * This solves the problem of a P2P link and a LAN interface 224 * having the same address, which can result in the wrong 225 * interface being assigned to the packet when fed back 226 * into the divert socket. Theoretically if the daemon saves 227 * and re-uses the sockaddr_in as suggested in the man pages, 228 * this iface name will come along for the ride. 229 * (see div_output for the other half of this.) 230 */ 231 strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname, 232 sizeof(divsrc.sin_zero)); 233 } 234 235 /* Put packet on socket queue, if any */ 236 sa = NULL; 237 nport = htons((u_int16_t)divert_info(mtag)); 238 INP_INFO_RLOCK(&divcbinfo); 239 LIST_FOREACH(inp, &divcb, inp_list) { 240 INP_LOCK(inp); 241 /* XXX why does only one socket match? */ 242 if (inp->inp_lport == nport) { 243 sa = inp->inp_socket; 244 SOCKBUF_LOCK(&sa->so_rcv); 245 if (sbappendaddr_locked(&sa->so_rcv, 246 (struct sockaddr *)&divsrc, m, 247 (struct mbuf *)0) == 0) { 248 SOCKBUF_UNLOCK(&sa->so_rcv); 249 sa = NULL; /* force mbuf reclaim below */ 250 } else 251 sorwakeup_locked(sa); 252 INP_UNLOCK(inp); 253 break; 254 } 255 INP_UNLOCK(inp); 256 } 257 INP_INFO_RUNLOCK(&divcbinfo); 258 if (sa == NULL) { 259 m_freem(m); 260 ipstat.ips_noproto++; 261 ipstat.ips_delivered--; 262 } 263} 264 265/* 266 * Deliver packet back into the IP processing machinery. 267 * 268 * If no address specified, or address is 0.0.0.0, send to ip_output(); 269 * otherwise, send to ip_input() and mark as having been received on 270 * the interface with that address. 271 */ 272static int 273div_output(struct socket *so, struct mbuf *m, 274 struct sockaddr_in *sin, struct mbuf *control) 275{ 276 struct m_tag *mtag; 277 struct divert_tag *dt; 278 int error = 0; 279 280 m->m_pkthdr.rcvif = NULL; 281 282 if (control) 283 m_freem(control); /* XXX */ 284 285 if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) { 286 mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag), 287 M_NOWAIT | M_ZERO); 288 if (mtag == NULL) { 289 error = ENOBUFS; 290 goto cantsend; 291 } 292 dt = (struct divert_tag *)(mtag+1); 293 m_tag_prepend(m, mtag); 294 } else 295 dt = (struct divert_tag *)(mtag+1); 296 297 /* Loopback avoidance and state recovery */ 298 if (sin) { 299 int i; 300 301 dt->cookie = sin->sin_port; 302 /* 303 * Find receive interface with the given name, stuffed 304 * (if it exists) in the sin_zero[] field. 305 * The name is user supplied data so don't trust its size 306 * or that it is zero terminated. 307 */ 308 for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++) 309 ; 310 if ( i > 0 && i < sizeof(sin->sin_zero)) 311 m->m_pkthdr.rcvif = ifunit(sin->sin_zero); 312 } 313 314 /* Reinject packet into the system as incoming or outgoing */ 315 if (!sin || sin->sin_addr.s_addr == 0) { 316 struct ip *const ip = mtod(m, struct ip *); 317 struct inpcb *inp; 318 319 dt->info |= IP_FW_DIVERT_OUTPUT_FLAG; 320 INP_INFO_WLOCK(&divcbinfo); 321 inp = sotoinpcb(so); 322 INP_LOCK(inp); 323 /* 324 * Don't allow both user specified and setsockopt options, 325 * and don't allow packet length sizes that will crash 326 */ 327 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 328 ((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) { 329 error = EINVAL; 330 m_freem(m); 331 } else { 332 /* Convert fields to host order for ip_output() */ 333 ip->ip_len = ntohs(ip->ip_len); 334 ip->ip_off = ntohs(ip->ip_off); 335 336 /* Send packet to output processing */ 337 ipstat.ips_rawout++; /* XXX */ 338 339#ifdef MAC 340 mac_create_mbuf_from_inpcb(inp, m); 341#endif 342 error = ip_output(m, 343 inp->inp_options, NULL, 344 ((so->so_options & SO_DONTROUTE) ? 345 IP_ROUTETOIF : 0) | 346 IP_ALLOWBROADCAST | IP_RAWOUTPUT, 347 inp->inp_moptions, NULL); 348 } 349 INP_UNLOCK(inp); 350 INP_INFO_WUNLOCK(&divcbinfo); 351 } else { 352 dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG; 353 if (m->m_pkthdr.rcvif == NULL) { 354 /* 355 * No luck with the name, check by IP address. 356 * Clear the port and the ifname to make sure 357 * there are no distractions for ifa_ifwithaddr. 358 */ 359 struct ifaddr *ifa; 360 361 bzero(sin->sin_zero, sizeof(sin->sin_zero)); 362 sin->sin_port = 0; 363 ifa = ifa_ifwithaddr((struct sockaddr *) sin); 364 if (ifa == NULL) { 365 error = EADDRNOTAVAIL; 366 goto cantsend; 367 } 368 m->m_pkthdr.rcvif = ifa->ifa_ifp; 369 } 370#ifdef MAC 371 SOCK_LOCK(so); 372 mac_create_mbuf_from_socket(so, m); 373 SOCK_UNLOCK(so); 374#endif 375 /* Send packet to input processing */ 376 ip_input(m); 377 } 378 379 return error; 380 381cantsend: 382 m_freem(m); 383 return error; 384} 385 386static int 387div_attach(struct socket *so, int proto, struct thread *td) 388{ 389 struct inpcb *inp; 390 int error; 391 392 INP_INFO_WLOCK(&divcbinfo); 393 inp = sotoinpcb(so); 394 if (inp != 0) { 395 INP_INFO_WUNLOCK(&divcbinfo); 396 return EINVAL; 397 } 398 if (td && (error = suser(td)) != 0) { 399 INP_INFO_WUNLOCK(&divcbinfo); 400 return error; 401 } 402 error = soreserve(so, div_sendspace, div_recvspace); 403 if (error) { 404 INP_INFO_WUNLOCK(&divcbinfo); 405 return error; 406 } 407 error = in_pcballoc(so, &divcbinfo, "divinp"); 408 if (error) { 409 INP_INFO_WUNLOCK(&divcbinfo); 410 return error; 411 } 412 inp = (struct inpcb *)so->so_pcb; 413 INP_LOCK(inp); 414 INP_INFO_WUNLOCK(&divcbinfo); 415 inp->inp_ip_p = proto; 416 inp->inp_vflag |= INP_IPV4; 417 inp->inp_flags |= INP_HDRINCL; 418 INP_UNLOCK(inp); 419 return 0; 420} 421 422static int 423div_detach(struct socket *so) 424{ 425 struct inpcb *inp; 426 427 INP_INFO_WLOCK(&divcbinfo); 428 inp = sotoinpcb(so); 429 if (inp == 0) { 430 INP_INFO_WUNLOCK(&divcbinfo); 431 return EINVAL; 432 } 433 INP_LOCK(inp); 434 in_pcbdetach(inp); 435 INP_INFO_WUNLOCK(&divcbinfo); 436 return 0; 437} 438 439static int 440div_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 441{ 442 struct inpcb *inp; 443 int error; 444 445 INP_INFO_WLOCK(&divcbinfo); 446 inp = sotoinpcb(so); 447 if (inp == 0) { 448 INP_INFO_WUNLOCK(&divcbinfo); 449 return EINVAL; 450 } 451 /* in_pcbbind assumes that nam is a sockaddr_in 452 * and in_pcbbind requires a valid address. Since divert 453 * sockets don't we need to make sure the address is 454 * filled in properly. 455 * XXX -- divert should not be abusing in_pcbind 456 * and should probably have its own family. 457 */ 458 if (nam->sa_family != AF_INET) 459 error = EAFNOSUPPORT; 460 else { 461 ((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY; 462 INP_LOCK(inp); 463 error = in_pcbbind(inp, nam, td->td_ucred); 464 INP_UNLOCK(inp); 465 } 466 INP_INFO_WUNLOCK(&divcbinfo); 467 return error; 468} 469 470static int 471div_shutdown(struct socket *so) 472{ 473 struct inpcb *inp; 474 475 INP_INFO_RLOCK(&divcbinfo); 476 inp = sotoinpcb(so); 477 if (inp == 0) { 478 INP_INFO_RUNLOCK(&divcbinfo); 479 return EINVAL; 480 } 481 INP_LOCK(inp); 482 INP_INFO_RUNLOCK(&divcbinfo); 483 socantsendmore(so); 484 INP_UNLOCK(inp); 485 return 0; 486} 487 488static int 489div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 490 struct mbuf *control, struct thread *td) 491{ 492 /* Packet must have a header (but that's about it) */ 493 if (m->m_len < sizeof (struct ip) && 494 (m = m_pullup(m, sizeof (struct ip))) == 0) { 495 ipstat.ips_toosmall++; 496 m_freem(m); 497 return EINVAL; 498 } 499 500 /* Send packet */ 501 return div_output(so, m, (struct sockaddr_in *)nam, control); 502} 503 504void 505div_ctlinput(int cmd, struct sockaddr *sa, void *vip) 506{ 507 struct in_addr faddr; 508 509 faddr = ((struct sockaddr_in *)sa)->sin_addr; 510 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 511 return; 512 if (PRC_IS_REDIRECT(cmd)) 513 return; 514} 515 516static int 517div_pcblist(SYSCTL_HANDLER_ARGS) 518{ 519 int error, i, n; 520 struct inpcb *inp, **inp_list; 521 inp_gen_t gencnt; 522 struct xinpgen xig; 523 524 /* 525 * The process of preparing the TCB list is too time-consuming and 526 * resource-intensive to repeat twice on every request. 527 */ 528 if (req->oldptr == 0) { 529 n = divcbinfo.ipi_count; 530 req->oldidx = 2 * (sizeof xig) 531 + (n + n/8) * sizeof(struct xinpcb); 532 return 0; 533 } 534 535 if (req->newptr != 0) 536 return EPERM; 537 538 /* 539 * OK, now we're committed to doing something. 540 */ 541 INP_INFO_RLOCK(&divcbinfo); 542 gencnt = divcbinfo.ipi_gencnt; 543 n = divcbinfo.ipi_count; 544 INP_INFO_RUNLOCK(&divcbinfo); 545 546 error = sysctl_wire_old_buffer(req, 547 2 * sizeof(xig) + n*sizeof(struct xinpcb)); 548 if (error != 0) 549 return (error); 550 551 xig.xig_len = sizeof xig; 552 xig.xig_count = n; 553 xig.xig_gen = gencnt; 554 xig.xig_sogen = so_gencnt; 555 error = SYSCTL_OUT(req, &xig, sizeof xig); 556 if (error) 557 return error; 558 559 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 560 if (inp_list == 0) 561 return ENOMEM; 562 563 INP_INFO_RLOCK(&divcbinfo); 564 for (inp = LIST_FIRST(divcbinfo.listhead), i = 0; inp && i < n; 565 inp = LIST_NEXT(inp, inp_list)) { 566 INP_LOCK(inp); 567 if (inp->inp_gencnt <= gencnt && 568 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 569 inp_list[i++] = inp; 570 INP_UNLOCK(inp); 571 } 572 INP_INFO_RUNLOCK(&divcbinfo); 573 n = i; 574 575 error = 0; 576 for (i = 0; i < n; i++) { 577 inp = inp_list[i]; 578 if (inp->inp_gencnt <= gencnt) { 579 struct xinpcb xi; 580 xi.xi_len = sizeof xi; 581 /* XXX should avoid extra copy */ 582 bcopy(inp, &xi.xi_inp, sizeof *inp); 583 if (inp->inp_socket) 584 sotoxsocket(inp->inp_socket, &xi.xi_socket); 585 error = SYSCTL_OUT(req, &xi, sizeof xi); 586 } 587 } 588 if (!error) { 589 /* 590 * Give the user an updated idea of our state. 591 * If the generation differs from what we told 592 * her before, she knows that something happened 593 * while we were processing this request, and it 594 * might be necessary to retry. 595 */ 596 INP_INFO_RLOCK(&divcbinfo); 597 xig.xig_gen = divcbinfo.ipi_gencnt; 598 xig.xig_sogen = so_gencnt; 599 xig.xig_count = divcbinfo.ipi_count; 600 INP_INFO_RUNLOCK(&divcbinfo); 601 error = SYSCTL_OUT(req, &xig, sizeof xig); 602 } 603 free(inp_list, M_TEMP); 604 return error; 605} 606 607/* 608 * This is the wrapper function for in_setsockaddr. We just pass down 609 * the pcbinfo for in_setpeeraddr to lock. 610 */ 611static int 612div_sockaddr(struct socket *so, struct sockaddr **nam) 613{ 614 return (in_setsockaddr(so, nam, &divcbinfo)); 615} 616 617/* 618 * This is the wrapper function for in_setpeeraddr. We just pass down 619 * the pcbinfo for in_setpeeraddr to lock. 620 */ 621static int 622div_peeraddr(struct socket *so, struct sockaddr **nam) 623{ 624 return (in_setpeeraddr(so, nam, &divcbinfo)); 625} 626 627#ifdef SYSCTL_NODE 628SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT"); 629SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0, 630 div_pcblist, "S,xinpcb", "List of active divert sockets"); 631#endif 632 633struct pr_usrreqs div_usrreqs = { 634 .pru_attach = div_attach, 635 .pru_bind = div_bind, 636 .pru_control = in_control, 637 .pru_detach = div_detach, 638 .pru_peeraddr = div_peeraddr, 639 .pru_send = div_send, 640 .pru_shutdown = div_shutdown, 641 .pru_sockaddr = div_sockaddr, 642 .pru_sosetlabel = in_pcbsosetlabel 643}; 644 645struct protosw div_protosw = { 646 SOCK_RAW, NULL, IPPROTO_DIVERT, PR_ATOMIC|PR_ADDR, 647 div_input, NULL, div_ctlinput, ip_ctloutput, 648 NULL, 649 div_init, NULL, NULL, NULL, 650 &div_usrreqs 651}; 652 653static int 654div_modevent(module_t mod, int type, void *unused) 655{ 656 int err = 0; 657 int n; 658 659 switch (type) { 660 case MOD_LOAD: 661 /* 662 * Protocol will be initialized by pf_proto_register(). 663 * We don't have to register ip_protox because we are not 664 * a true IP protocol that goes over the wire. 665 */ 666 err = pf_proto_register(PF_INET, &div_protosw); 667 ip_divert_ptr = divert_packet; 668 break; 669 case MOD_QUIESCE: 670 /* 671 * IPDIVERT may normally not be unloaded because of the 672 * potential race conditions. Tell kldunload we can't be 673 * unloaded unless the unload is forced. 674 */ 675 err = EPERM; 676 break; 677 case MOD_UNLOAD: 678 /* 679 * Forced unload. 680 * 681 * Module ipdivert can only be unloaded if no sockets are 682 * connected. Maybe this can be changed later to forcefully 683 * disconnect any open sockets. 684 * 685 * XXXRW: Note that there is a slight race here, as a new 686 * socket open request could be spinning on the lock and then 687 * we destroy the lock. 688 */ 689 INP_INFO_WLOCK(&divcbinfo); 690 n = divcbinfo.ipi_count; 691 if (n != 0) { 692 err = EBUSY; 693 INP_INFO_WUNLOCK(&divcbinfo); 694 break; 695 } 696 ip_divert_ptr = NULL; 697 err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW); 698 INP_INFO_WUNLOCK(&divcbinfo); 699 INP_INFO_LOCK_DESTROY(&divcbinfo); 700 uma_zdestroy(divcbinfo.ipi_zone); 701 break; 702 default: 703 err = EOPNOTSUPP; 704 break; 705 } 706 return err; 707} 708 709static moduledata_t ipdivertmod = { 710 "ipdivert", 711 div_modevent, 712 0 713}; 714 715DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); 716MODULE_DEPEND(dummynet, ipfw, 2, 2, 2); 717MODULE_VERSION(ipdivert, 1); 718